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Detective sergeant Dewi Harding Jones said: “We have to find out who this person is before we can investigate what happened to him and why.

“Hopefully we can identify the person and give the victim’s family some answers to this mystery.”

On tonight’s Crimewatch on BBC One, detectives will reveal for the first time a detailed picture of what the victim could have looked like and appeal for help from anyone who may recognise a loved one or friend.

They’ve worked closely with a leading forensic artist and odontologist on the case, both of whom will reveal what they know on the programme at 9pm on BBC One.